Laurie – I’d say you are accurate. The laboratory wastewater rule exempts toxic (T) wastewaters generated by laboratory operations from RCRA as long as the total percent of the laboratory wastewaters don’t exceed 1% of the facility’s total discharge. It may be that the student’s former institution was using that as a basis for legal disposal. However, the pH of that mixture can be expected to be about 1.8-2.0, which would mean the waste would carry the characteristic of corrosivity. The laboratory waste exclusion does not apply in this case as described. If the pH were adjusted, perhaps, but it doesn’t sound like they are doing that. The dilution should result in a flashpoint above 140F and the mixture is therefore not flammable, so corrosivity is the sticking point. No other listing or characteristic applies.
Proper disposal involves either acid-base neutralization and discharge, within the limits of the local sewer authority’s discharge parameters and ideally with their permission, or removal and disposal by your hazardous waste vendor.
WC Environmental, LLC
1085C Andrew Drive
West Chester, PA 19380
Cell - 610-322-0657
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From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Laurie Yoder
Sent: Tuesday, October 04, 2016 1:00 PM
Subject: [DCHAS-L] HPLC solvent disposal
We have a research group that wants to begin a HPLC project using tetrafluoroacetic acid/acetonitrile mix (diluted to 40% in water) as the solvent. The student working on the project has used this procedure at another institution and said they dumped the waste solvent down the drain. Really? I thought this would still have some characteristic hazard. Does anyone else have experience with this mixture, and how do you dispose of it properly?
Laurie M. Yoder
Assistant Professor of Chemistry and Chemical Hygiene Officer
Eastern Mennonite University
1200 Park Road
Harrisonburg, VA 22802
--- This e-mail is from DCHAS-L, the e-mail list of the ACS Division of Chemical Health and Safety. For more information about the list, contact the Divisional secretary at secretary**At_Symbol_Here**dchas.org
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